FeedFinder::error PHP Метод

    function error($index = NULL)
    {
        $message = NULL;
        if (count($this->_error) > 0) {
            if (is_scalar($index) and !is_null($index)) {
                $message = $this->_error[$index];
            } else {
                $message = implode(" / ", $this->_error) . "\n";
            }
        }
        return $message;
    }